All sounds are made by the vibrations of material objects.
Common Origins of Sound:
Vibrating Strings:piano, violin, guitar
Vibrating Reed:Saxophone, clarinet
Fluttering Column of Air (at the mouthpiece): flute
Vibrating Vocal Chords: your voice
The original vibration stimulates the vibration of a larger or more massive material...
(Some examples of materials that are often stimulated:
the sounding board of a stringed instrument, the air column within a reed or a wind instrument, or the air in the throat and mouth of a singer.)
...This vibrating material then sends a disturbance through a surrounding medium (usually air) in the form of Longitudinal Waves.
The frequency of the vibrating source = the frequency of sound waves produced.
Pitch – How we describe our subjective impression about the frequency
High Pitched Sound = Hight Vibration Frequency
Low Pitched Sound = Low Vibration Frequency
Infrasonic – Sound waves with frequencies below 20 hertz Ultrasonic – Sound waves with frequencies above 20,000 hertz
Young can usually hear pitches with frequencies from 20 to 20,000
26.2Sound in Air
Comression- The pulse of compressed air
Rarefaction- A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression.
26.3Media That Transmit Sound
26.4Speed of Sound
26.5Loudness
26.6Forced Vibration
Forced Vibration- The vibration of an object that is made to vibrate by another vibrating object that is nearby. The sounding board in a musical instrument amplifies the sound through forced vibration.
26.7Natural Frequency
Natural Frequency- A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.
26.8Resonance
Resonance- A phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results.
26.9Interference
26.10Beats Beats – The periodic variation in the loudnessof sound.
Chapter 26: Sound
26.1 Origin of Sound
All sounds are made by the vibrations of material objects.
Common Origins of Sound:
Vibrating Strings: piano, violin, guitar
Vibrating Reed: Saxophone, clarinet
Fluttering Column of Air (at the mouthpiece): flute
Vibrating Vocal Chords: your voice
The original vibration stimulates the vibration of a larger or more massive material...
- (Some examples of materials that are often stimulated:
...This vibrating material then sends a disturbance through a surrounding medium (usually air) in the form of Longitudinal Waves.the sounding board of a stringed instrument, the air column within a reed or a wind instrument, or the air in the throat and mouth of a singer.)
The frequency of the vibrating source = the frequency of sound waves produced.
Pitch – How we describe our subjective impression about the frequency
High Pitched Sound = Hight Vibration Frequency
Low Pitched Sound = Low Vibration Frequency
Infrasonic – Sound waves with frequencies below 20 hertz
Ultrasonic – Sound waves with frequencies above 20,000 hertz
Young can usually hear pitches with frequencies from 20 to 20,000
26.2 Sound in Air
Comression- The pulse of compressed air
Rarefaction- A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression.
26.3 Media That Transmit Sound
26.4 Speed of Sound
26.5 Loudness
26.6 Forced Vibration
Forced Vibration- The vibration of an object that is made to vibrate by another vibrating object that is nearby. The sounding board in a musical instrument amplifies the sound through forced vibration.
26.7 Natural Frequency
Natural Frequency- A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.
26.8 Resonance
Resonance- A phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results.
26.9 Interference
26.10 Beats
Beats – The periodic variation in the loudness of sound.